Ok guys, the source is a well known brazillian website called omelete (it's the biggest entertainment website over here actually), basically they claim that their insiders confirmed the game is already in production and it'll be releasing in 2015.

That's nuts. The DLC isn't even out yet and they're already going to have a sequel ready for next year? We don't even know when Uncharted for PS4 is coming out, and that's been in development for several years.